tDCS - Transcranial Direct Current Stimulation (tDCS) Device including an EXTRA 6 pairs of sponges (8 pairs of cellulose sponges total). Your TDCS device comes with effective and modern safety features: tDCS v2.1 - Modern, safety designed transcranial direct current stimulation (tDCS) device with 4 selectable current levels. Advanced tDCS circuitry. LED lit screen for safe nighttime use. TheBrainDriver Deluxe tDCS System includes everything you need to get started; Main unit. Comfortable electrode positioning headband. Color-coded wire set. 2 color-coded electrodes. 2 pairs of cellulose sponges. 9 volt battery. Sturdy case. Device output selections (industry recognized TDCS highly accurate output levels; 0.5mA, 1.0mA, 1.5mA, 2.0mA. TheBrainDriver v2.1 includes numerous comfort and safety features; Battery level indicator, 20 & 30 minute safety timer with automatic shut-off at end of session, automatic shut-off when not in use. Automatic shut-off when not properly attached, overload protection. Backlit LCD Screen for Night Time use, Beep tone to indicate power-on & end-of-session. Slowly ramps the current up/down for the most comfortable session. Pocket-sized & very portable for easy travel! NO METER NECESSARY as in the older Analog devices still on the market. Our modern digital circuitry utilizes enhanced electronics and precision components which produces highly accurate levels of current. Professional grade system.